SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
mysql error number: 2002
Date: 21.05.2024 @ 00:24
Script: /wbb/board.php?boardid=21&sid=fc2655b82b923f9653073f3fe4d4a290&daysprune=1000&sortfield=lastposttime&sortorder=DESC&page=2
Referer: http://www.delftseschaaksite.nl/wbb/board.php?boardid=21&sid=fc2655b82b923f9653073f3fe4d4a290&daysprune=1000&sortfield=lastposttime&sortorder=DESC&page=2